MathsWhizz1928 MathsWhizz1928

12-06-2016
Mathematics

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Please help me with these questions! It's an urgent! Thanks! And can u also tell me how to work it out

Please help me with these questions Its an urgent Thanks And can u also tell me how to work it out class=

Respuesta :

19-06-2016

11. (x-1) (x-1) = x^2 - x - x + 1 = x^2 - 2x + 1

12. (x+7) (x-7) = x^2 - 7x +7x - 49 = x^2 - 49

14. 2x + 5 > 3 <=> 2x > -2 <=> x > -1
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